Table 3.

Unadjusted and multivariable-adjusted linear regression models examining differences in serum phosphorus (mg/dL) as a function of indices of socioeconomic status. Results are depicted as regression coefficients (95% confidence intervals)

	Annual Family Income				Educational Achievement
	> $75,000	$50,000–$75,000	$25–49,999	< $25,000	> HS	HS	< HS
N	647	459	772	786	1777	460	427
Unadjusted	ref	0.02 (−0.04, 0.09)	0.07 (0.01. 0.13)	0.10 (0.05, 0.16)	ref	0.08 (0.02, 0.13)	0.05 (−0.01, 0.10)
Model 2*	ref	0.01 (−0.05, 0.07)	0.02 (−0.04, 0.07)	0.05 (−0.01, 0.11)	ref	0.04 (−0.01, 0.09)	0.03 (−0.03, 0.08)
Model 3**	ref	−0.01 (−0.07, 0.06)	0.02 (−0.04, 0.07)	0.05 (−0.01, 0.11)	ref	0.04 (−0.02, 0.09)	0.03 (−0.03, 0.09)

HS, high school graduate

^*Adjusted for age, gender, race/ethnicity, clinical site, body mass index, eGFR, and urine albumin to creatinine ratio.

^**Adjusted for variables in model 2 and estimated total caloric and phosphorus intake.